Question: Two fair tetrahedrons (4 sided), each with equal sides numbered from 1 to 4, are identical except that one is red and the other

Two fair tetrahedrons (4 sided), each with equal sides numbered from 1

Two fair tetrahedrons (4 sided), each with equal sides numbered from 1 to 4, are identical except that one is red and the other white. If the two tetrahedrons are tossed and the number on the bottom face of each is observed, what is the probability of the the event "the sum of the numbers is 7"?

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